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Community EcologyI. Introduction
II. Multispecies Interactions with a Trophic Level
III. Multispecies Interactions across Trophic Levels
IV. Succession
A. Definitions
B. Types
C. Mechanisms
- facilitation, tolerance, and inhibition
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Facilitated:
early species change environment and increase the probability of successful colonization by later species.
examples: colonization of bare rock: lichens, moss, herbs;
colonization of carcasses: beetles, flies, etc.
Aspen fix nitrogen that helps nitrogen-limited trees colonize
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Tolerance:
Tolerance: early species have no effect on later species. This occurs if there is 'ecological equivalence' among the species. Many stages in later forest succession seem dominated by this mechanism.
Also, later species tolerate early species... so shade tolerant species come to dominate because they tolerate the shade of early species.
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Inhibition:
Early species retard the colonization success of later species. If these effects vary among early species, there can be "priority effects". The species that gets there first has a differential and deterministic effect on the subsequent structure of the community. Important where allelopathic interactions occur. Bryozoans block colonization of tunicates and sponges.
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Community EcologyI. Introduction
II. Multispecies Interactions with a Trophic Level
III. Multispecies Interactions across Trophic Levels
IV. Succession
A. Definitions
B. Types
C. Mechanisms
D. Model – Tilman 1985
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3. Model: Tilman (1985).... ready?
A A, B BOur old 2-species model with stable coexistence possible.
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3. Model: Tilman (1985)
A A, B BIf resource supply rates are negatively correlated, then the community may succeed from A to A-B coexistence to B as concentrations change
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3. Model: Tilman (1985)
A A, B BB, C
C ...and then to B,C and C.... and etc....
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3. Model: Tilman (1985)
A A, B BB, C
C ...and then to B,C and C.... and etc....
C, D
D
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Community EcologyI. Introduction
II. Multispecies Interactions with a Trophic Level
III. Multispecies Interactions across Trophic Levels
IV. Succession
A. Definitions
B. Types
C. Mechanisms
D. Model – Tilman 1985
E. Community Patterns
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E. Community Patterns (From Morin, 1998)
Variable Early Late
Organism Size small large
life history r K
Biomass low high
Richness, Diversity low high
Structural complexity low high
Niches broad narrow
Nutrient cycles open closed
Stability low high
trophic relationships linear web-like
connectance low high
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BIODIVERSITY
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Community EcologyI. Introduction
II. Multispecies Interactions with a Trophic Level
III. Multispecies Interactions across Trophic Levels
IV. Succession
V. Biodiversity: Patterns and Processes
A.The Species-Area Relationship
1. The pattern
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"species - area relationship"
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S = CAz
log10S = log10 C + z log10 A
where C is the y intercept and z is the slope of the line.
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"species - area relationship"
Breedings Birds - North Am.
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"species - area relationship"
Island Area log(square km)
Num
ber o
f Bat
Spe
cies
log(
N)
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Community EcologyI. Introduction
II. Multispecies Interactions with a Trophic Level
III. Multispecies Interactions across Trophic Levels
IV. Succession
V. Biodiversity: Patterns and Processes
A.The Species-Area Relationship
1. The pattern
2. The Theory of Island Biogeography
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MacArthur and Wilson (1967)
THEORY OF ISLAND BIOGEOGRAPHY
Edward O. Wilson
Prof. Emer., Harvard
Robert MacArthur
1930-1972
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MacArthur and Wilson (1967)
THEORY OF ISLAND BIOGEOGRAPHY
- Species Richness is a balance between
COLONIZATION (adds species)
and
EXTINCTION (subtracts species)
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- Colonization Increases with Area
- larger target
- more habitats
Mainland
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confirmation: greater immigration rate on larger islands
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- Colonization Increases with Area
- larger target
- more habitats
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- Colonization Increases with Area
- larger target
- more habitats (except very small)
Niering, W.A. 1963. Terrestrial ecology of Kapingamarangi Atoll, Caroline Islands. Ecological Monographs 33:131-160.
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- Colonization Increases with Area
- larger target
- more habitats
- Extinction Decreases with Area
- more food means larger populations that are less likely to bounce to a size of "0" (extinction)
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- Extinction Decreases with Area
Wright, S.J. 1980. Density compensation in island avifaunas. Oecologia 45: 385-389.
Wright, S. J. 1985. How isolation affects rates of turnover of species on islands. Oikos 44:331-340.
Reduced Turnover on larger islands
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RA
TE
species richness
COL - smallEXT - small
COL - large
EXT - large
SMALL LARGE
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- Colonization Decreases with Distance
- fewer species can reach
Mainland
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saturation is the % of species found on a patch of mainland that size
- Colonization Decreases with Distance
- fewer species can reach
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- Extinction Increases with Distance
- recolonization less likely at distance
Mainland
"Rescue Effect"
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- Extinction Increases with Distance
- recolonization less likely at distance
Wright, S.J. 1980. Density compensation in island avifaunas. Oecologia 45: 385-389.
Wright, S. J. 1985. How isolation affects rates of turnover of species on islands. Oikos 44:331-340.
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RA
TE
species richness
COL - farEXT - far
COL - close
EXT - close
far close
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Equilbrium Island Biogeography & TurnoverTurnover on "Landbridge" islands (California Channel Islands)
Island Area km2
Distance km
Bird Spp. 1917
Bird Spp. 1968
Extinctions
Human Introd.
Immigrations
Turnover %
Los Coronados 2.6 13 11 11 4 0 4 36
San Nicholas 57 98 11 11 6 2 4 50
San Clemente 145 79 28 24 9 1 4 25
Santa Catalina 194 32 30 34 6 1 9 24
Santa Barbara 2.6 61 10 6 7 0 3 62
San Miguel 36 42 11 15 4 0 8 46
Santa Rosa 218 44 14 25 1 1 11 32
Santa Cruz 249 31 36 37 6 1 5 17
Anacapa 2.9 21 15 14 5 0 4 31
Diamond, J.M. 1969. Avifaunal equilibria and species turnover rates on the Channel Islands of California. Proc. Natl. Acad. Sci 64: 57-63. Jones, H.L. and Diamond, J.M. 1976. Short-time-base studies of turnover in breeding bird populations on the Channel Islands of California. Condore 73: 526-549. [+]
equilibria
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Equilbrium Island Biogeography & TurnoverTurnover on "Landbridge" islands (California Channel Islands)
Island Area km2
Distance km
Bird Spp. 1917
Bird Spp. 1968
Extinctions
Human Introd.
Immigrations
Turnover %
Los Coronados 2.6 13 11 11 4 0 4 36
San Nicholas 57 98 11 11 6 2 4 50
San Clemente 145 79 28 24 9 1 4 25
Santa Catalina 194 32 30 34 6 1 9 24
Santa Barbara 2.6 61 10 6 7 0 3 62
San Miguel 36 42 11 15 4 0 8 46
Santa Rosa 218 44 14 25 1 1 11 32
Santa Cruz 249 31 36 37 6 1 5 17
Anacapa 2.9 21 15 14 5 0 4 31
Diamond, J.M. 1969. Avifaunal equilibria and species turnover rates on the Channel Islands of California. Proc. Natl. Acad. Sci 64: 57-63. Jones, H.L. and Diamond, J.M. 1976. Short-time-base studies of turnover in breeding bird populations on the Channel Islands of California. Condore 73: 526-549. [+]
equilibria and turnover
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Dramatic evidence that, although the communities had recovered in terms of species richness, the composition was very different with typically about 80% of the species turning over.
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Community EcologyI. Introduction
II. Multispecies Interactions with a Trophic Level
III. Multispecies Interactions across Trophic Levels
IV. Succession
V. Biodiversity: Patterns and Processes
A.The Species-Area Relationship
1. The pattern
2. The Theory of Island Biogeography
3. Why is this important? Fragmentation
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- Why is this important?
- all habitats except the atmosphere are islands.
Continents -
big islands
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White-faced Saki (Pithecia pithecia)
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White-faced Saki (Pithecia pithecia)
Monk Saki (Pithecia monachus)
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White-faced Saki (Pithecia pithecia)
Monk Saki (Pithecia monachus)
White-footed Saki (Pithecia albicans)
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White-faced Saki (Pithecia pithecia)
Monk Saki (Pithecia monachus)
White-footed Saki (Pithecia albicans)
Rio Tapajos Saki (Pithecia irrorata)
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Minnesota: Land O'Lakes
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"Sky Islands"
High elevation habitats separated by inhospitable (desert) habitat.
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- Why is this important?
- all habitats except the atmosphere are islands.
- human activity fragments a landscape, making lots of islands, too.
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Bolivia has lost 50% of its rainforest in last 30 years
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Even Costa Rica has lost 95% of its old growth forest that is outside of national parks...